Contraception
Volume 79, Issue 3 , Pages 178-181 , March 2009

Contraceptive failure related to estimated cycle day of conception relative to the start of the last bleeding episode

  • Ellen R. Wiebe

      Affiliations

    • Department of Family Practice, University of British Columbia, Vancouver, BC, Canada V5Z1H9
    • Corresponding Author InformationCorresponding author. Tel.: +1 604 709 5611; fax: +1 604 873 8304.
    • ,
  • James Trussell

      Affiliations

    • Office of Population Research, Princeton University, Princeton, NJ 08540, USA
    • The Hull York Medical School, University of Hull, Hull HU6 7RX, England, UK

Received 12 June 2008 ,Revised 4 October 2008 ,Accepted 6 October 2008.

References 

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  2. Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. effects on the probability of conception, survival of the pregnancy, and sex of the baby. N Engl J Med. 1995;333:1517–1521
  3. Ahrendt HJ, Nisand I, Bastianelli C, et al. Efficacy, acceptability and tolerability of the combined contraceptive ring, NuvaRing, compared with an oral contraceptive containing 30 microg of ethinyl estradiol and 3 mg of drospirenone. Contraception. 2006;74:451–457
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  13. Birtch RL, Olatunbosun OA, Pierson RA. Ovarian follicular dynamics during conventional vs. continuous oral contraceptive use. Contraception. 2006;73:235–243
  14. Baerwald AR, Olatunbosun OA, Pierson RA. Effects of oral contraceptives administered at defined stages of ovarian follicular development. Fertil Steril. 2006;86:27–35
  15. Baerwald AR, Olatunbosun OA, Pierson RA. Ovarian follicular development is initiated during the hormone-free interval of oral contraceptive use. Contraception. 2004;70:371–377
  16. Potter L, Oakley D, de Leon-Wong E, Canamar R. Measuring compliance among oral contraceptive users. Fam Plan Perspect. 1998;28:154–158
  17. Sparrow MJ. Pill method failures in women seeking abortion: fourteen years experience. N Z Med J. 1998;111:368–388
  18. Vessey M. Oral contraceptive failures and body weight: findings in a large cohort study. J Fam Plann Reprod Health Care. 2001;27:90–91
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☆ This research was supported by the Vancouver Foundation through a BC Medical Services Foundation grant to the Community Based Clinical Investigator (CBCI) Program at UBC's Department of Family Practice.

PII: S0010-7824(08)00485-X

doi: 10.1016/j.contraception.2008.10.004

Contraception
Volume 79, Issue 3 , Pages 178-181 , March 2009

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